Ventilated rotary brush



Feb. 20;?1940. H, NI 2,191,115

VENTiLATED'ROTARY BRUSH Filed Dec. 24, 1936 2 Sheets-Sheet 1 J I R. 4 g auri 1 5 f/erzrzf 7%?21 ATTO 5 Feb. 20, 1940.

L. H. NIELSEN VENTILAIED ROTARY BRUSH 2 Sheets-Sheet 2 Filed Dec. 24, 1936 INVENTOR. L (tar/76 flew/v16 71!?[6672 $4115 0% 1;

ATTORNEYS.

rateniedreuco, 1940 1 2,191,115

UNITED STATES PATENT rice VENTILATED ROTARY BRUSH Laurits Henrik Nielsen, Kolding, Denmark, as-

signor to The Osborn Manufacturing Company,

Cleveland, Ohio, a corporation of Ohio Application December24, 1936, Serial No. 117,601

In Great Britain June 29, 1 936 9 Claims. (01. 15--l81) Rotary brushes subjected to rapid rotation are ripheral apertures at the back of the hub, as in rarely worn out by mere abrasion, since the heat Figs. 5 to 7. generated by the friction of the brush against In Figs. 5 to 7 the hub comprises a central the work has a detrimental effect on the bristles axial boss a, spokes k radiating therefromand 5 and causes the latter to break up before they are defining interior recesses 11, flanges f and 9 only 5 worn out. one of which happens to be here shown as re- The object of the present invention is to remmovable, and brush rings 01 which preferably edy this defect, and the invention consists essenare not provided with vent apertures. tially in providing the brush with a hub adapted The front flange or cover plate a is centrally 10 to act as a fan for driving a cooling air through apertured as at m to permit ingress of air: sur- 10 the brush. rounding the shaft 11. The spokes .k are relieved By this arrangement detrimental heating of attheir upper. ends as at p facilitating inflow of the bristles will be effectively obviated. air, in a manner similar to that shown at p in i The air, which enters centrally at one end of Fig. 2. The flange or rear face plate 9" is perthe hub, may be driven by centrifugal force either forated with'a series :of holes 1* disposed well out- 15 through grooves or through apertures in the wardly from the central boss at, whereby cenbrush rings and through the spaces betweenthe trifugal eiiect sets up air currents as shown in bristlesor through peripheral apertures at the Fig. 6.

back of the hub. Although the brush sections d are not ar- Fig. lis a face view, with part of one face plate ranged with radial vents, it will be appreciated broken away to show interior features; that where :a greater volume of air flow is neces- Fig. 2 is an axial section on the plane 2-2 of sary or where conditions otherwise make radial Fig. l, with certain features in elevation; escape desirable, the ventilated sections such as Fig. 3 is a face view on plane 3-3 of Fig. 2, d of Fig. 2 may be used with the hub of Fig. 5, 25 showing the hub alone with the front plate reall as shown in Fig. 8. 9s moved; 1 Both in the form shown in Fig. 1 and that Fig. 4 is a view corresponding to Fig. 2 but limshown in Fig, 5, the several brush rings or secited to thebrush section rings; tions, at or d, carry inwardly directed lugs s to Fig. 5 is a front view corresponding to Fig. I prevent circumferential slipping. The brush but illustrating a modified form; rings d of Fig.1 are grooved as at c to allow ra- 30 Fig. 6 is an axial section on the plane 6--6 of" dial discharge of air and are indented as shown Fig. 5; at u in Fig. l or o in Fig. 5 to prevent creeping 1 Fig. 7 is an axial section on plane 1-4! of Fig. 5; of the bristles. and It will beappreciated by those skilled in the 5 Fig. 8 is an axial section corresponding toFig. art that modifications of proportions, sizes and 6 but showing a modified form. arrangement details can be made within the The brush comprises an assembly of brus scope of the invention. rings at mounted in juxtaposition between flanges Having now particularly described and ascerf and g on a hub a. The latter is provided with tained the nature of my said invention and in tapering recesses b carried in axial direction and what manner the same .is to be performed, I 40 communicating at their deeper ends with the atdeclare that what I claim is: mosphere through a central aperture h in the i l. A rotary brush including in combination flange 1. The brush rings are radially grooved hub members adapted to act as a fan for driving so as to form channels 0 through which the reair through the brush, wherein the hub is processes b communicate with the spaces between vided with recesses which communicate with the 45 the bristles. The hub parts between the recesses atmosphere through a central aperture at one b form radial vanes which, when the brush is in end of the hub and form between them radial operation, induce. by centrifugal force an all vanes operative to drive air by centrifugal force current which enters the hub through the aperthrough apertures remote from the axis of rota 5o tureh and passes out through the channels 0 and tion. through the spaces betwen the bristles e. An 2. Arotary brusht comprising in combination a effective cooling of the brush will thus take place plurality of side-adjacent turns of metal-channel which prevents the deterioration of the bristles. brush material, a hub whereon said turns are Instead of leading the air out through the mounted, comprising in combination a plurality 5:; brush rings, it may be discharged through peof spokes extending from end to end of said hub v inwardly along the axial length of the hub, a

central axial bore through the intersection of said spokes, an edge defining an opening through one end plate at the cut-away of the spokes, said axial bore extending through the other end plate,

- and openings to the atmosphere from said air spaces peripherally more remote than said inlet opening from the axis of rotation.

3. A rotary brush comprising in combination a plurality of sections, a hub whereon said sections are mounted, said hub'including a central boss of approximate conical shape when'seen in axial section, a plurality of walls in spoke-like arrangement extending the axial length of said hub, a

cover plate at each end of said spoke-like walls,

and brush sections supported by the outerv faces of said walls, and clamped between said cover plates, with air passages through one of said cover plates. v

4. A rotary brush comprising in combinatio a plurality of sections, a hub whereon said sections are mounted, said hub including a central boss of approximate conical shape when seen in axial section, a plurality of walls in spoke-like arrangement extending the axial length of said hub, a cover plate at each end of said spoke-like walls, and brush sections supported by the outer faces of said walls, and clamped between said cover plates, with air passages through one of said cover plates and between said sections.

5. Alrotary brush comprising in combination a plurality of circumferential ring-shaped sec tions, a hub whereon said sections are mounted, said hub comprising in combination a plurality of spokes extending from end to end of said hub,

plates secured to said spokes at each end, said brush sections being mounted on the outer faces of said spokes, and inwardly projecting lugs on said sections adapted to engage said spokes.

6. A ventilated rotary brush or the like, comprising in combination a plurality of sections, and a hub whereon said sections are mounted, said hub comprising an axial boss and a plurality of spokes thereon, plates at each end of said spokes covering the spaces between the spokes and pre-- venting axial movement of the sections, an inner .edge of one of said plates concentric with the axis a hub whereon said sections are mounted, said hub comprising an axial boss and a plurality of spokes thereon, plates at each end of said spokes covering the spaces between the spokes and preventing axial movement of the sections, an inner edge ofone of said plates concentricwith the axis defining an opening to the spaces between said spokes, and air passage means between said sections.

8. A ventilated rotary brush comprising in combination a plurality of sections and a hub, said 'hu'b comprising an axial boss and a plurality of spoke plates springing therefrom, said boss and the inner corners of said spokes being relieved at one .end, flange plates at each end of said spokes, a central opening through one of said flange plates at the relieved corners of the spokes, and paraxial openings in the other of said flange plates placed further from the axis than said central opening.

' 9. A rotary brush including in combination hub members adapted to act as a fan for driving air through the brush, wherein the hub is provided with recesses which communicate with the atmosphere through a central aperture at one end of the hub and form between them radial vanes operative to drive air by centrifugal force through apertures remote from the axis of rotation between the brush channels and through the 

